Andreas Kling fe48e27a05 LibJS: Replace GC::Weak with GC::RawPtr in inline cache entries ...

Property lookup cache entries previously used GC::Weak<T> for shape,
prototype, and prototype_chain_validity pointers. Each GC::Weak
requires a ref-counted WeakImpl allocation and an extra indirection
on every access.

Replace these with GC::RawPtr<T> and make Executable a WeakContainer
so the GC can clear stale pointers during sweep via remove_dead_cells.

For static PropertyLookupCache instances (used throughout the runtime
for well-known property lookups), introduce StaticPropertyLookupCache
which registers itself in a global list that also gets swept.

Now that inline cache entries use GC::RawPtr instead of GC::Weak,
we can compare shape/prototype pointers directly without going
through the WeakImpl indirection. This removes one dependent load
from each IC check in GetById, PutById, GetLength, GetGlobal, and
SetGlobal handlers.

2026-03-08 10:27:13 +01:00

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